CN113532898A - State evaluation method for steam-water separator body of supercritical or ultra-supercritical boiler - Google Patents
State evaluation method for steam-water separator body of supercritical or ultra-supercritical boiler Download PDFInfo
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Abstract
A state evaluation method of a supercritical or ultra-supercritical boiler steam-water separator body comprises the following steps; 1) defining an evaluation object and basic information; 2) clearly evaluating the specific stage of the full life cycle of the object; 3) calculating a state factor; 4) calculating a correction factor; 5) defining detailed evaluation points; 6) preparing and implementing a metal inspection scheme; 7) obtaining a metal inspection result; 8) evaluating the dot state; 9) evaluating the state of an evaluation object; 10) and archiving and feeding back the evaluation result. The invention can help thermal power plant technicians to make maintenance strategies better.
Description
Technical Field
The invention belongs to the technical field of state evaluation of equipment of a thermal power plant, and particularly relates to a state evaluation method of a steam-water separator body of a supercritical or ultra-supercritical boiler.
Background
The steam-water separator of the supercritical or ultra-supercritical boiler is an important part of a boiler system of a thermal power plant, and in recent years, a large-scale high-parameter supercritical or ultra-supercritical thermal power generating unit frequently participates in peak shaving operation of a power grid, so that the steam-water separator of the supercritical or ultra-supercritical boiler is in a severe working condition in the operation process and is easily influenced by the action of heat exchange variable load. Particularly, the steam-water separator body is used as a large-wall-thickness part, quite high temperature difference stress exists, the temperature difference between the inner wall and the outer wall of the cylinder body is linearly distributed along the wall thickness, and the larger the thickness is, the larger the temperature difference is, and the larger the stress is. Because the steam-water separator of the supercritical or ultra-supercritical boiler is positioned outside the boiler, if the body has leakage accidents, the risk of causing great personal safety and economic loss exists, and therefore the state of the steam-water separator body of the supercritical or ultra-supercritical boiler needs to be accurately evaluated.
For supercritical or ultra-supercritical boiler steam-water separators, the analysis of transient stress of the steam-water separator based on a three-dimensional finite element model is reported in documents, such as the transient stress finite element analysis of a 1000MW boiler steam-water separator and a boiler technology, 2013(1), and the calculation of service life loss of the steam-water separator in a cold-state starting process by using a service life assessment calculation method under fatigue-creep interaction based on elastic analysis is also reported in documents, such as the cold-state starting safety analysis of the ultra-supercritical 1000MW unit boiler steam-water separator, thermal power generation, 2015 (2). Whether stress analysis or life loss calculation is performed, the following conditions are required: the evaluation personnel is required to have abundant basic knowledge of mathematical analysis, basic knowledge of metal materials, mechanical calculation knowledge, life evaluation knowledge and experience; collecting complete design data and design data; collecting complete operation history data; complete and comprehensive metal inspection related data needs to be collected; constructing a stress field model and a temperature field model; comprehensive laboratory analysis data on samples of the same material are required as a reference group and the like. These complex conditions determine that the development of stress analysis, life loss calculation and other techniques is limited to professional technical organizations and personnel, and the collection, complete and comprehensive metal inspection and laboratory analysis of these basic data and data can lead to the increase of overhaul cost and labor cost of the power plant.
Therefore, a universal method is needed to be found, assessment personnel do not need to have abundant mathematical analysis basic knowledge, metal material basic knowledge, mechanics calculation knowledge, service life assessment knowledge and experience, extra test cost is not needed, and the state of the supercritical or ultra-supercritical boiler steam-water separator body can be assessed only by obtaining existing metal inspection data, so that the technical personnel of the thermal power plant can be directly helped to make maintenance strategies.
Disclosure of Invention
In order to overcome the technical problems, the invention aims to provide a state evaluation method for a supercritical or ultra-supercritical boiler steam-water separator body, which helps thermal power plant technicians to make a maintenance strategy better.
In order to achieve the purpose, the technical scheme adopted by the invention and the beneficial effects of the invention are as follows:
a state evaluation method of a supercritical or ultra-supercritical boiler steam-water separator body comprises the following steps;
1) defining an evaluation object and basic information;
2) clearly evaluating the specific stage of the full life cycle of the object;
3) calculating a state factor;
4) calculating a correction factor;
5) defining detailed evaluation points;
6) preparing and implementing a metal inspection scheme;
7) obtaining a metal inspection result;
8) evaluating the dot state;
9) evaluating the state of an evaluation object;
10) and archiving and feeding back the evaluation result.
The evaluation object in the step 1) is a supercritical or ultra-supercritical boiler steam-water separator body, and the basic information comprises a design drawing, a design diameter, a design wall thickness, a design material and a detailed replacement or maintenance record file.
The step 2) comprises the following specific operation steps:
determining which stage of the steam-water separator body of the supercritical or ultra-supercritical boiler is in the early stage, the middle stage, the final stage and the final stage of the full life cycle;
| each stage of the life cycle | Time ranges of the stages of the full life cycle |
| Early stage | (0,0.1Lc] |
| Middle stage | (0.1Lc,0.6Lc] |
| End stage | (0.6Lc,0.85Lc] |
| End stage | (0.85Lc,Lc] |
Wherein L iscFor the design life, the design life of the unit is defined as 30 years.
The specific operation steps of calculating the state factor in the step 3) are as follows:
determining the corresponding state factor C based on the stage of the clear evaluation object in the step 2)S；
| Each stage of the life cycle | State factor CS |
| Early stage | 1+2s |
| Middle stage | 1+1s |
| End stage | 1+3s |
| End stage | 1+5s |
Wherein the value of s is looked up according to the following table based on the design and manufacturing data collected in step 1).
The specific operation steps for calculating the correction factor in the step 4) are as follows:
determining a correction factor C according to equation (1) based on feedback of the last evaluation result of the evaluation objectf；
In the formula, the values of the parameters δ and f are found in the following table.
The step 5) comprises the following specific operation steps:
all evaluation points of the evaluation object are specified and divided into: and the cylinder evaluation point, the head evaluation point, the longitudinal weld evaluation point and the circumferential weld evaluation point are respectively distinguished by the following corner marks bd, dh, lw and gw.
The step 6) comprises the following specific operation steps:
comprehensively considering the maintenance plan, time and cost, selecting proper items from the macroscopic inspection, the surface flaw detection, the nondestructive flaw detection, the metallographic inspection, the wall thickness measurement and the hardness inspection according to all the evaluation points determined in the step 5), making a metal inspection scheme and implementing the metal inspection scheme.
The specific operation steps of the step 7) are as follows:
obtaining all metal inspection results of the evaluation points according to the metal inspection items determined in the step 6), dividing the state parameters into three categories according to the metal inspection results, and confirming the state parameters CP and the weight Q corresponding to all the metal inspection items of the evaluation points.
The step 8) comprises the following specific operation steps:
performing state evaluation on the single evaluation point according to the metal inspection result obtained in the step 7), and defining the state of the single evaluation point as CjThe evaluation model is shown as formula (2);
state C of evaluation pointjThe value of (A) normally falls within [0,3.2 ]]In the interval range, CjWhen the value of (A) is changed from 0 to 3.2The state of the evaluation point is increasingly poor;
weight Q of the three types of state parameters in the formula (2)Ai、QBiAnd QCiGiving the rule of formula (3);
the specific operation steps in the step 9) are as follows:
counting the evaluation results of all the evaluation points obtained in the step 8) according to the classification of the cylinder evaluation points, the head evaluation points, the longitudinal weld evaluation points and the circumferential weld evaluation points (the lower corner marks are bd, dh, lw and gw respectively), counting the number k of the cylinder evaluation points, the number l of the head evaluation points, the number m of the longitudinal weld evaluation points and the number n of the circumferential weld evaluation points, and then carrying out overall evaluation on the evaluation object, wherein the evaluation model of the final state value is shown as a formula (10);
if the C value of the state of the evaluation object is 0, the state of the evaluation object is considered to be optimal, and when the C value changes from 0 to 3.2, the state of the evaluation object gradually becomes worse; when the C value is more than 2, the state of an evaluation object is general, but the state of some evaluation points is poor, so that the attention of technicians is attracted; when the C value is more than 2.5, the state of an evaluation object is poor, and the state of most evaluation points is poor; particularly, at the end stage and the final stage of the full life cycle, if the evaluation is continuously carried out for multiple times and the state C value of the evaluation object is gradually increased, the poor state of the evaluation object is also verified, and the enterprise should be ready for the whole replacement of the evaluation object. The step 10) comprises the following specific operation steps:
and (4) completely filing and recording the state evaluation result of the evaluation object obtained in the step 9), and feeding back for the next evaluation to calculate the correction factor in the step 4).
The first type state parameters in the step 8): macroscopic State parameter CPA1-jFrom the result M of the macroscopic examinationA1-j: { no defect found, a few suspected defects found, invention defect evident } definition, as shown in equation (4):
the first type state parameters in the step 8): surface state parameter CPA2-jResults M of surface inspectionA2-j: { no defect found, surface defect found but eliminated after sanding, surface defect found but still present after sanding } is defined as shown in equation (5):
the second type state parameters in the step 8): lossless State parameter CPB1-jFrom results M of non-destructive inspectionB1-j: { stage I, stage II, stage III, stage IV } definition, as shown in equation (6):
the second type state parameters in the step 8): tissue state parameter CPB2-jFrom results M of metallographic examinationB2-j: { level 1, level 2, level 3, level 4, level 5 } definition, as shown in equation (7):
the third type state parameter in the step 8): wall thickness State parameter CPC1-jResults M of wall thickness inspectionC1-jAs defined by formula (8):
in the formula (8), d0To design wall thickness, unitIs mm;
the third type state parameter in the step 8): hardness State parameter CPC2-jResults M from hardness testC2-jAs defined by formula (9):
in formula (7), MC2-jThe value range of (2) is related to the material.
The invention has the beneficial effects that:
according to the method, assessment personnel do not need to have rich basic knowledge, mechanical calculation knowledge, service life assessment knowledge and experience of metal materials, and extra test cost is not needed, and based on conventional metal inspection data such as macroscopic inspection, surface flaw detection, nondestructive flaw detection, metallographic inspection, wall thickness measurement and hardness inspection aiming at the steam-water separator body of the supercritical or ultra-supercritical boiler, the state of the steam-water separator body of the supercritical or ultra-supercritical boiler is assessed through correction of state factors and correction factors, so that the technical personnel of a thermal power plant are directly helped to make next maintenance strategy, if continuous and repeated assessment is carried out, the state C value of the steam-water separator body of the supercritical or ultra-supercritical boiler is gradually increased, the state is increasingly poor, and the enterprise needs to make preparation for overall replacement of an assessment object.
Taking the result of repairing the left steam-water separator body of a 660MW supercritical boiler in 12 months C in 2020 as an example, the state evaluation is performed according to the method of the invention, and the evaluation process and the final result are shown as follows.
Drawings
FIG. 1 is a schematic diagram of a state estimation process according to the present invention.
Detailed Description
The invention is further described in the following with reference to the accompanying drawings and examples.
As shown in fig. 1:
1) specifying evaluation target and basic information
Firstly, the clear evaluation object is a supercritical or ultra-supercritical boiler steam-water separator body, and whether the evaluation object is a cylinder, a seal head, a longitudinal welding line or a circumferential welding line, the evaluation object can be evaluated by the method.
In addition, information such as design drawings, design diameters, design wall thicknesses, design materials, and detailed replacement or maintenance records of the evaluation object needs to be collected and specified.
2) Specific stage of full life cycle of definite evaluation object
The state of the evaluation object has a certain relation with the specific stage of the full life cycle, and the equipment state is not good due to design and manufacturing defects and hidden danger left after installation in the early stage of the full life cycle. With the stable operation of the unit, the operator is gradually familiar with the equipment, and after the middle stage of the whole life cycle, the evaluation object reaches the optimal state and can last for a long time. When the end stage of the full life cycle is entered, the state of the evaluation object is gradually deteriorated under the influence of the long-term peak shaving operation of the unit. When the final stage of the full life cycle is entered, the material is aged gradually and quickly under the high-temperature and high-pressure service condition for a long time, and the state of an evaluation object is degraded rapidly.
It is unambiguously assessed which of the early, mid, end and final stages of the full life cycle the subject is in.
Wherein L iscFor a design life, it is generally defined as the design life of the unit of 30 years.
3) Calculating a state factor
Determining the corresponding state factor C based on 2) the stage of the clear evaluation objectS；
| Each stage of the life cycle | State factor CS |
| Early stage | 1+2s |
| Middle stage | 1+1s |
| End stage | 1+3s |
| End stage | 1+5s |
Wherein the value of s is looked up according to the following table based on the design and manufacturing data collected in 1).
If all indexes in the design and manufacturing data are normal and no major problems are found, the value of c is 0.01, otherwise, the evaluation personnel can adjust according to the problems found in the design and manufacturing stages and the actual conditions of the components.
4) Calculating a correction factor
Determining a correction factor C according to equation (1) based on feedback of the last evaluation result of the evaluation objectf；
In the formula, the values of the parameters δ and f are found in the following table.
5) Unambiguous detailed evaluation points
In order to know the actual state of an evaluation object in detail, it is generally suggested to select multiple positions (a cylinder, a head, a longitudinal weld and a circumferential weld) for the evaluation object to be tested, and since the test points ultimately participate in state evaluation, the test points are also called evaluation points, and the evaluation points are divided into: and the cylinder evaluation point, the head evaluation point, the longitudinal weld evaluation point and the circumferential weld evaluation point are respectively distinguished by the following corner marks bd, dh, lw and gw.
6) Making metal testing plan and implementing
Comprehensively considering the maintenance plan, time and cost, selecting proper items from the macroscopic inspection, the surface flaw detection, the nondestructive flaw detection, the metallographic inspection, the wall thickness measurement and the hardness inspection according to all the evaluation points determined in the step 5), making a metal inspection scheme and implementing the metal inspection scheme.
7) Obtaining a metal test result
Obtaining all metal inspection results of the evaluation points according to the metal inspection items determined in the step 6), dividing the state parameters into three categories according to the metal inspection results, and confirming the state parameters CP and the weight Q corresponding to all the metal inspection items of the evaluation points.
8) Evaluation point state evaluation
Performing state evaluation on the single evaluation point according to the metal inspection result obtained in the step 7), wherein the state of the single evaluation point is defined as CjThe evaluation model is shown in formula (2).
State C of evaluation pointjThe value of (A) normally falls within [0,3.2 ]]Within the interval, if CjThe value is 0, the state of the evaluation point is optimal, when CjThe state of the evaluation point becomes worse and worse when the value of (2) changes from 0 to 3.2.
Comprehensively considering the importance of various metal inspection items and the implementation frequency, result accuracy and other factors, and weighting Q for the three types of state parameters in the formula (2)Ai、QBiAnd QCiGiving the rule of formula (3);
the evaluation methods of three types of state parameters of a single evaluation point are given below.
8.1) evaluation of the first-type State parameters
8.1.1) evaluation of the macroscopic State parameters corresponding to the macroscopic examination
Result of macroscopic examination MA1-jTypically one of the sets { no defect found, out-of-standard defect } corresponding to the macro state parameter CPA1-jIs as defined in formula (4)Shown in the figure.
8.1.2) evaluation of surface State parameters corresponding to surface inspection
Result M of surface inspectionA2-jGenerally { no defect found, surface defect found but eliminated after polishing, surface defect found but still present after polishing }, corresponding to surface condition parameter CP }A2-jIs as defined in formula (5).
8.2) evaluation of the second type of State parameters
8.2.1) non-destructive State parameter evaluation corresponding to non-destructive inspection
The nondestructive inspection can be carried out by ultrasonic, magnetic powder, penetration or ray detection according to actual conditions, and the result M of the nondestructive inspectionB1-jGenerally defined as { I level, II level, III level and IV level }, if a plurality of nondestructive inspection projects are implemented, the nondestructive inspection result with the highest grade is selected as the nondestructive inspection result, and the corresponding nondestructive state parameter CP is selectedB1-jIs as defined in formula (6).
8.2.2) evaluation of nondestructive State parameters corresponding to metallographic examination
Result of metallographic examination MB2-jGenerally defined as { level 1, level 2, level 3, level 4, level 5 }, and its corresponding organization state parameter CPB2-jIs as defined in formula (7).
8.3) evaluation of the third State parameters
8.3.1) evaluation of the wall thickness State parameters corresponding to the wall thickness check
The evaluation object is subjected to erosion and corrosion of steam in the high-temperature operation process to generate high-temperature oxidation, and the process consumes the base metal of the evaluation object, so that the evaluation object is thin in wall thickness, bears larger stress and has a worse state. Results M of wall thickness inspectionC1-jCorresponding wall thickness state parameter CPC1-jIs as defined in formula (8).
In the formula (8), d0For design wall thickness, units are mm.
8.3.2) evaluation of hardness State parameters corresponding to the hardness test
The aging phenomenon gradually occurs when the evaluation object is operated under a high temperature condition, thereby causing a gradual decrease in hardness, which deteriorates the condition of the evaluation object, possibly resulting in the occurrence of failure. Results M of hardness testC2-jCorresponding hardness state parameter CPC2-jIs as defined in formula (9).
In formula (9), MC2-jThe value range of (2) is related to the material.
9) Evaluation object state evaluation
And (3) counting all the evaluation points obtained in the step (8) according to the classification (lower corner marks are bd, dh, lw and gw respectively) of the cylinder evaluation points, the head evaluation points, the longitudinal weld evaluation points and the circumferential weld evaluation points, counting the number k of the cylinder evaluation points, the number l of the head evaluation points, the number m of the longitudinal weld evaluation points and the number n of the circumferential weld evaluation points, then carrying out overall evaluation on the evaluation object, and finally obtaining an evaluation model of the state value as shown in the formula (10).
If the C value of the state of the evaluation object is 0, the state of the evaluation object is considered to be optimal, and when the C value changes from 0 to 3.2, the state of the evaluation object gradually becomes worse; when the C value is more than 2, the state of an evaluation object is general, but the state of some evaluation points is poor, so that the attention of technicians is attracted; when the C value is more than 2.5, the state of an evaluation object is poor, and the state of most evaluation points is poor; particularly, at the end stage and the final stage of the full life cycle, if the evaluation is continuously carried out for multiple times and the state C value of the evaluation object is gradually increased, the poor state of the evaluation object is also verified, and the enterprise should be ready for the whole replacement of the evaluation object.
10) Assessment result archiving and feedback
And completely recording the state evaluation result of the evaluation object obtained in the step 9), and feeding back for the next evaluation to calculate the correction factor in the step 4).
By adopting the technical scheme, the state of the supercritical or ultra-supercritical boiler steam-water separator body is obtained through evaluation, so that a thermal power plant technician can be helped to know the actual state of the supercritical or ultra-supercritical boiler steam-water separator body, the change trend of the state of the supercritical or ultra-supercritical boiler steam-water separator body can be predicted through multiple state evaluation results aiming at the same evaluation point, the state results of all the evaluation points can be integrated to evaluate the overall state of the supercritical or ultra-supercritical boiler steam-water separator body, and the method has important significance in making an overhaul plan and a replacement strategy.
Claims (10)
1. A state evaluation method of a supercritical or ultra-supercritical boiler steam-water separator body is characterized by comprising the following steps;
1) defining an evaluation object and basic information;
2) clearly evaluating the specific stage of the full life cycle of the object;
3) calculating a state factor;
4) calculating a correction factor;
5) defining detailed evaluation points;
6) preparing and implementing a metal inspection scheme;
7) obtaining a metal inspection result;
8) evaluating the dot state;
9) evaluating the state of an evaluation object;
10) and archiving and feeding back the evaluation result.
2. The method for evaluating the state of the supercritical or ultra-supercritical boiler steam-water separator body according to claim 1, wherein the evaluation object in step 1) is the supercritical or ultra-supercritical boiler steam-water separator body, and the basic information includes design drawings, design diameters, design wall thicknesses, design materials and detailed replacement or maintenance processing record files.
3. The method for evaluating the state of the steam-water separator body of the supercritical or ultra-supercritical boiler according to claim 1, wherein the step 2) comprises the following specific operation steps:
determining which stage of the steam-water separator body of the supercritical or ultra-supercritical boiler is in the early stage, the middle stage, the final stage and the final stage of the full life cycle;
wherein L iscFor a design life, it is generally defined as the design life of the unit of 30 years.
4. The method for evaluating the state of the steam-water separator body of the supercritical or ultra-supercritical boiler according to claim 1, wherein the specific operation steps in the step 3) are as follows:
determining the corresponding state factor C based on the stage of the clear evaluation object in the step 2)S；
Wherein the value of s is looked up according to the following table based on the design and manufacturing data collected in step 1).
5. The method for evaluating the state of the steam-water separator body of the supercritical or ultra-supercritical boiler according to claim 1, wherein the step 4) comprises the following specific operation steps:
inverse method based on last evaluation result of evaluation objectDetermining a correction factor C according to equation (1)f；
In the formula, the values of the parameters δ and f are found in the following table.
6. The method for evaluating the state of the steam-water separator body of the supercritical or ultra-supercritical boiler according to claim 1, wherein the step 5) comprises the following specific operation steps:
all evaluation points of the evaluation object are specified and divided into: and the cylinder evaluation point, the head evaluation point, the longitudinal weld evaluation point and the circumferential weld evaluation point are respectively distinguished by the following corner marks bd, dh, lw and gw.
7. The method for evaluating the state of the steam-water separator body of the supercritical or ultra-supercritical boiler according to claim 1, wherein the step 6) comprises the following specific operation steps:
comprehensively considering the maintenance plan, time and cost, selecting proper items from the macroscopic inspection, the surface flaw detection, the nondestructive flaw detection, the metallographic inspection, the wall thickness measurement and the hardness inspection according to all the evaluation points determined in the step 5), making a metal inspection scheme and implementing the metal inspection scheme.
8. The method for evaluating the state of the steam-water separator body of the supercritical or ultra-supercritical boiler according to claim 1, wherein the step 7) comprises the following specific operation steps:
obtaining all metal inspection results of the evaluation points according to the metal inspection items determined in the step 6), dividing the state parameters into three categories according to the metal inspection results, and confirming the state parameters CP and the weight Q corresponding to all the metal inspection items of the evaluation points.
9. The method for evaluating the state of the steam-water separator body of the supercritical or ultra-supercritical boiler according to claim 1, wherein the step 8) comprises the following specific operation steps:
performing state evaluation on the single evaluation point according to the metal inspection result obtained in the step 7), and defining the state of the single evaluation point as CjThe evaluation model is shown as formula (2);
if Max(CPAi-j,CPBi-j,CPCi-j)＜1
else
Cj＝3.2×Max(CPAi-j,CPBi-j,CPCi-j)
(2)
state C of evaluation pointjThe value of (A) normally falls within [0,3.2 ]]Within the interval, if CjThe value is 0, the state of the evaluation point is optimal, when CjWhen the value of (a) is changed from 0 to 3.2, the state of the evaluation point becomes worse and worse;
weight Q of the three types of state parameters in the formula (2)Ai、QBiAnd QCiGiving the rule of formula (3);
the first type state parameters in the step 8): macroscopic State parameter CPA1-jFrom the result M of the macroscopic examinationA1-j: { no defect found, a few suspected defects found, invention defect evident } definition, as shown in equation (4):
the first type state parameters in the step 8): surface state parameter CPA2-jResults M of surface inspectionA2-j: { no defect found, surface defect found but eliminated after sanding, surface defect found but still present after sanding } is defined as shown in equation (5):
the second type state parameters in the step 8): lossless State parameter CPB1-jFrom results M of non-destructive inspectionB1-j: { stage I, stage II, stage III, stage IV } definition, as shown in equation (6):
the second type state parameters in the step 8): tissue state parameter CPB2-jFrom results M of metallographic examinationB2-j: { level 1, level 2, level 3, level 4, level 5 } definition, as shown in equation (7):
the third type state parameter in the step 8): wall thickness State parameter CPC1-jResults M of wall thickness inspectionC1-jAs defined by formula (8):
in the formula (8), d0For design wall thickness, in mm;
the third type state parameter in the step 8): hardness State parameter CPC2-jResults M from hardness testC2-jAs defined by formula (9):
10. the method for evaluating the state of the steam-water separator body of the supercritical or ultra-supercritical boiler according to claim 1, wherein the specific operation steps in the step 9) are as follows:
counting all the evaluation points obtained in the step 8) according to the classification of the cylinder evaluation points, the head evaluation points, the longitudinal weld evaluation points and the circumferential weld evaluation points (the lower corner marks are bd, dh, lw and gw respectively), counting the number k of the cylinder evaluation points, the number l of the head evaluation points, the number m of the longitudinal weld evaluation points and the number n of the circumferential weld evaluation points, and then carrying out overall evaluation on an evaluation object, wherein an evaluation model of a final state value is shown as a formula (10);
if the value of the state C of the evaluation object is 0, the state of the evaluation object is considered to be optimal, and when the value of P is changed from 0 to 3.2, the state of the evaluation object gradually becomes worse; when the C value is more than 2, the state of an evaluation object is general, and the state of some evaluation points is poor, so that the attention of technicians is required; when the C value is more than 2.5, the state of an evaluation object is poor, and the state of most evaluation points is poor; particularly, at the end stage and the final stage of the full life cycle, if the evaluation is continuously carried out for multiple times and the state C value of the evaluation object is gradually increased, the poor state of the evaluation object is also verified, and the enterprise should be ready for the whole replacement of the evaluation object.
The specific operation steps in the step 10) are as follows:
and completely recording and archiving the state evaluation result of the evaluation object obtained in the step 9), and feeding back the state evaluation result for the next evaluation to calculate the correction factor of the step 4).
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